Why are there almost never microphone drops?

..And when microphone drops do happen, they're often USB microphones or such.
As an audiophile creator, getting a good microphone for a good deal is EXTREMELY hard. Microphones of good quality go for well over 100$, plus the interface needed to run them. I always check Massdrop hoping to find some good XLR microphone or interface drops, but they seem extremely lacking.